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295 questions found · practise this subject as a set
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| # | Question | Subject and topic | Difficulty |
|---|---|---|---|
| 251 | The relationship between a cuckoo and a crow, in which the crow incubates the cuckoo's eggs, is called | Biology/Biological Studies/Biotechnology/Biochemistry Population interactions |
Easy |
| 252 | In which interaction does one species benefit while the other is neither harmed nor benefited? | Biology/Biological Studies/Biotechnology/Biochemistry Population interactions |
Easy |
| 253 | Five closely related warbler species live in the same tree, but each feeds in a different part of the canopy.… | Biology/Biological Studies/Biotechnology/Biochemistry Population interactions |
Medium |
| 254 | Which pair shows mutualism? | Biology/Biological Studies/Biotechnology/Biochemistry Population interactions |
Medium |
| 255 | A prickly pear cactus introduced into Australia spread rapidly over large areas until a cactus-feeding moth f… | Biology/Biological Studies/Biotechnology/Biochemistry Population interactions |
Hard |
| 256 | The vertical distribution of different plant species at different heights in a forest is called | Biology/Biological Studies/Biotechnology/Biochemistry Structure and function of ecosystems |
Easy |
| 257 | Which of these is a man-made ecosystem? | Biology/Biological Studies/Biotechnology/Biochemistry Structure and function of ecosystems |
Easy |
| 258 | In a pond, decomposers such as fungi and bacteria are most abundant | Biology/Biological Studies/Biotechnology/Biochemistry Structure and function of ecosystems |
Medium |
| 259 | Which statement about the functioning of an ecosystem is correct? | Biology/Biological Studies/Biotechnology/Biochemistry Structure and function of ecosystems |
Medium |
| 260 | A student sets up a sealed glass aquarium with water plants, snails and microbes and keeps it in the dark for… | Biology/Biological Studies/Biotechnology/Biochemistry Structure and function of ecosystems |
Hard |
| 261 | Net primary productivity is equal to | Biology/Biological Studies/Biotechnology/Biochemistry Productivity and decomposition |
Easy |
| 262 | The dark, amorphous, nutrient-rich substance formed during decomposition that is very resistant to microbial … | Biology/Biological Studies/Biotechnology/Biochemistry Productivity and decomposition |
Easy |
| 263 | A grassland has a gross primary productivity of 1500 kcal m⁻² yr⁻¹, and the plants lose 400 kcal m⁻² yr⁻¹ in … | Biology/Biological Studies/Biotechnology/Biochemistry Productivity and decomposition |
Medium |
| 264 | During decomposition, water-soluble nutrients move down into the soil and get precipitated as unavailable sal… | Biology/Biological Studies/Biotechnology/Biochemistry Productivity and decomposition |
Medium |
| 265 | Leaf litter from two trees is left on the forest floor. Litter X is rich in lignin; litter Y is rich in nitro… | Biology/Biological Studies/Biotechnology/Biochemistry Productivity and decomposition |
Hard |
| 266 | Approximately what fraction of photosynthetically active radiation is captured by plants? | Biology/Biological Studies/Biotechnology/Biochemistry Energy flow |
Easy |
| 267 | The food chain that begins with dead organic matter is called | Biology/Biological Studies/Biotechnology/Biochemistry Energy flow |
Easy |
| 268 | The mass of living material present at a trophic level at a particular time is called | Biology/Biological Studies/Biotechnology/Biochemistry Energy flow |
Medium |
| 269 | Producers in a grassland fix 20,000 J of energy. Using the 10 per cent law, how much energy reaches the secon… | Biology/Biological Studies/Biotechnology/Biochemistry Energy flow |
Medium |
| 270 | Food chains in nature rarely have more than four or five trophic levels. The main reason is that | Biology/Biological Studies/Biotechnology/Biochemistry Energy flow |
Hard |
| 271 | Which ecological pyramid is always upright, whatever the ecosystem? | Biology/Biological Studies/Biotechnology/Biochemistry Ecological pyramids |
Easy |
| 272 | The pyramid of biomass in a sea is generally inverted because | Biology/Biological Studies/Biotechnology/Biochemistry Ecological pyramids |
Easy |
| 273 | A single large tree supports thousands of caterpillars, which are eaten by a few birds. The pyramid of number… | Biology/Biological Studies/Biotechnology/Biochemistry Ecological pyramids |
Medium |
| 274 | Which is a limitation of ecological pyramids? | Biology/Biological Studies/Biotechnology/Biochemistry Ecological pyramids |
Medium |
| 275 | In an ecosystem, the energy available is 10,000 J at the producer level. Assuming 10 per cent transfer, what … | Biology/Biological Studies/Biotechnology/Biochemistry Ecological pyramids |
Hard |
| 276 | Variation in the concentration of reserpine in Rauwolfia vomitoria growing in different Himalayan ranges is a… | Biology/Biological Studies/Biotechnology/Biochemistry Biodiversity: concept and patterns |
Easy |
| 277 | The rivet popper hypothesis, which compares species in an ecosystem to rivets in an aeroplane, was proposed by | Biology/Biological Studies/Biotechnology/Biochemistry Biodiversity: concept and patterns |
Easy |
| 278 | In the species–area relationship log S = log C + Z log A, the value of Z for very large areas such as whole c… | Biology/Biological Studies/Biotechnology/Biochemistry Biodiversity: concept and patterns |
Medium |
| 279 | Which is NOT one of the standard explanations for the high species diversity of the tropics? | Biology/Biological Studies/Biotechnology/Biochemistry Biodiversity: concept and patterns |
Medium |
| 280 | An ecologist finds that a grassland plot with 16 plant species shows much smaller year-to-year changes in tot… | Biology/Biological Studies/Biotechnology/Biochemistry Biodiversity: concept and patterns |
Hard |
| 281 | Which is considered the most important cause driving animals and plants to extinction? | Biology/Biological Studies/Biotechnology/Biochemistry Loss of biodiversity |
Easy |
| 282 | The introduction of the Nile perch into Lake Victoria led to the extinction of many species of | Biology/Biological Studies/Biotechnology/Biochemistry Loss of biodiversity |
Easy |
| 283 | Which animal became extinct mainly because of over-exploitation by humans? | Biology/Biological Studies/Biotechnology/Biochemistry Loss of biodiversity |
Medium |
| 284 | The Amazon rain forest is called the "lungs of the planet". Which human activity is a major threat to it? | Biology/Biological Studies/Biotechnology/Biochemistry Loss of biodiversity |
Medium |
| 285 | A plant species that depends on a single species of moth for pollination becomes extinct soon after the moth … | Biology/Biological Studies/Biotechnology/Biochemistry Loss of biodiversity |
Hard |
| 286 | Exploring molecular, genetic and species-level diversity to find products of economic importance is called | Biology/Biological Studies/Biotechnology/Biochemistry Conservation approaches |
Easy |
| 287 | The argument that every species has an intrinsic value even if it is of no economic use to humans is the | Biology/Biological Studies/Biotechnology/Biochemistry Conservation approaches |
Easy |
| 288 | A villager argues that a forest must be saved because it supplies firewood, fruits and medicinal herbs to his… | Biology/Biological Studies/Biotechnology/Biochemistry Conservation approaches |
Medium |
| 289 | Pollination of crops by bees and birds is cited as a reason for conserving biodiversity under which argument? | Biology/Biological Studies/Biotechnology/Biochemistry Conservation approaches |
Medium |
| 290 | Which statement correctly matches a conservation argument with its basis? | Biology/Biological Studies/Biotechnology/Biochemistry Conservation approaches |
Hard |
| 291 | Which of the following is an ex situ method of conservation? | Biology/Biological Studies/Biotechnology/Biochemistry In situ and ex situ conservation |
Easy |
| 292 | Species that are confined to a particular region and found nowhere else are called | Biology/Biological Studies/Biotechnology/Biochemistry In situ and ex situ conservation |
Easy |
| 293 | Which of the following biodiversity hotspots covers part of India? | Biology/Biological Studies/Biotechnology/Biochemistry In situ and ex situ conservation |
Medium |
| 294 | The Khasi and Jaintia Hills of Meghalaya are well known for | Biology/Biological Studies/Biotechnology/Biochemistry In situ and ex situ conservation |
Medium |
| 295 | A rare orchid survives only in a small forest patch that is about to be flooded by a dam. Which conservation … | Biology/Biological Studies/Biotechnology/Biochemistry In situ and ex situ conservation |
Hard |